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  • C07D487/04—Ortho-condensed systems

Definitions

• the present invention relates to 3-guanidinocarbonyl-1-heteroaryl-indole derivatives of the formula (I)
• inventive compounds are suitable for example as antiarrhythmic medicaments with a cardioprotective component for infarction prophylaxis and infarction treatment and for the treatment of angina pectoris. They also inhibit in a preventive manner the pathophysiological processes associated with the development of ischemia-induced damage, in particular in the triggering of ischemia-induced cardiac arrhythmias and of heart failure.
• the invention relates to compounds of the formula I, in which
• R1 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms
• R2 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, alkoxy having 1 , 2, 3, 4, 5 or 6 carbon atoms or OH,
• R3 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, alkoxy having 1 , 2, 3, 4, 5 or 6 carbon atoms or OH,
• R4 is alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, alkylamino having 1 , 2, 3, 4, 5 or 6 carbon atoms or NH2 and racemic mixtures, enantiomers and diastereomers thereof and mixtures thereof, tautomers thereof and pharmaceutically acceptable salts thereof.
• R1 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms
• R2 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, alkoxy having 1 , 2, 3, 4, 5 or 6 carbon atoms or OH
• R3 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, alkoxy having i , 2, 3, 4, 5 or 6 carbon atoms or OH
• Ar is quinoline, isoquinoline, quinazoline or 7H-pyrrolo-[2,3-d]-pyrimidine, which may be linked via any of its positions and which is substituted in at least one of its positions by alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, nitro, NRaRb, alkylcarbonylamino having 1 , 2, 3 or 4 carbon atoms, hydroxyl, alkoxy having 1 , 2, 3, 4, 5 or 6 carbon atoms, S(0) n R4, CO2H, alkoxycarbonyl having
• Ra and Rb are independent of each other hydrogen, linear or branched alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms or Ra and Rb form, together with the nitrogen atom to which they are attached, a 5- or 6-membered heterocycle, which may optionally contain another hetero atom chosen from O, S and N,
• R4 is alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, alkylamino having 1 , 2, 3, 4, 5 or 6 carbon atoms or NH2 and racemic mixtures, enantiomers and diastereomers thereof and mixtures thereof, tautomers thereof and pharmaceutically acceptable salts thereof.
• R1 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms
• R2 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, alkoxy having 1 , 2, 3, 4, 5 or 6 carbon atoms or OH,
• R3 is hydrogen or alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, alkoxy having 1 , 2, 3, 4, 5 or 6 carbon atoms or OH
• Ar is 4-quinolinyl, 4-quinazolinyl or 4-(7H-pyrrolo-[2,3-d]-pyrimjdinyl), which is substituted in at least one of its positions by alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, halogen, nitro, NRaRb, alkylcarbonylamino having 1 , 2, 3 or 4 carbon atoms, hydroxyl, alkoxy having 1 , 2, 3, 4, 5 or 6 carbon atoms, S(O) n R4, CO2H, alkoxycarbonyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, alkylcarbonyl having 1 , 2, 3, 4, 5 or 6 carbon atoms, CONRaRb, CN, polyfluoroalkyl having 1 , 2, 3 or 4
• compounds of the formula I are defined as above and R1 represents a hydrogen or methyl.
• compounds of the formula I are defined as above and R2 and R3 represent independent of each other hydrogen, methyl or methoxy, preferably R2 hydrogen or methoxy and R3 hydrogen.
• compounds of the formula I are defined as above and Ar is substituted by one or two substituents, preferably one substituent, chosen from the group of methyl, ethyl, F, CI, Br, methoxy, ethoxy or CF3, preferably from the group of methyl, F, CI, methoxy or CF3.
• inventive compounds contain one or more centers of asymmetry, these may independently of one another have the S and the R configuration.
• the compounds may be in the form of optical isomers, of diastereomers, of racemates or of mixtures thereof in any ratio.
• the present invention encompasses all tautomeric forms of the compounds of the formula I.
• Alkyl radicals may be straight-chain or branched. This also applies if they carry substituents or occur as substituents of other radicals, for example in alkylamino, alkylcarbonylamino, alkoxy, alkoxycarbonyl, alkylcarbonyl, polyfluoroalkyl or polyfluoroalkoxy radicals.
• Preferred alkyl radicals are methyl, ethyl, n-propyl, isopropyl, tert-butyl and isobutyl.
• hydrogen atoms in alkyl radicals may be replaced by fluorine atoms to form polyfluoroalkyl radicals.
• examples of such radicals are difluoromethyl, trifluoromethyl, pentafluoroethyl, 2,2,2-trifluoroethyl; 3,3,3- trifluoropropyl, trifluorobutyl.
• Polyfluoroalkoxy radicals are alkoxy radicals of 1 to 3 carbons substituted by 1 , 2, 3, 4, 5, 6 or 7 fluorine atoms, in particular- trifluoromethoxy.
• Examples of the group NRaRb in which Ra and Rb form, together with the nitrogen atom to which they are attached, a saturated or unsaturated 5- or 6-membered heterocycle, are piperidin-1-yl, pyrrolidin-1-yl, morpholin-4-yl, thiomorpholin-4-yl or piperazin-1-yl.
• 9- or 10-membered bicyclic heteroaryl radicals having one, two or three nitrogen atoms, may be attached by all positions, for example by the 1 position, 2 position, 3 position, 4 position, 5 position, 6 position, 7 position or 8 position.
• heteroaryl radicals are quinoline, isoquinoline, quinazoline, cinnoline, quinoxaline, phthalazine or 7H-pyrrolo-[2,3-d]-pyrimidine.
• Substituted heteroaryl radicals may be substituted in any positions.
• halogen radicals are either chlorine, bromine, fluorine or iodine.
• the compounds of the formula I inhibit the cellular sodium-proton antiporter (Na + /H + - exchanger, NHE), in particular they inhibit the subtype NHE1. Because of the NHE- inhibitory properties, the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are suitable for the prevention and treatment of diseases caused by activation of or activated NHE, and of diseases caused secondarily by the NHE-related damage.
• Patent EP 639 573 discloses heteroaroylguanidine derivatives as NHE inhibitors. Specific indole derivatives are disclosed, but no compounds with a substituted, bicyclic heteroaryl group in position 1 and with the guanidinocarbonyl in position 3.
• Patent EP 622 356 discloses indoloylguanidines with a substituent on the nitrogen of the indole, which is hydrogen or a substituted or unsubstituted alkyl or a cycloalkyl or an OH or an alkoxy.
• the compounds of the formula (I) can be used as novel medicaments in the treatment of diseases as inhibitors of NHE and in particular of NHE-1 with good selectivity for NHE-1 with respect to NHE-2. This good selectivity makes it possible to reduce the potential gastrointestinal side effects existing with regard to molecules having inadequate selectivity (J. Clin. Invest, 1998, 101 (6), 1243; Comparative Medicine, 2000, 50(5), 511 ).
• NHE inhibitors predominantly act via their effect on cellular pH regulation, they can generally be combined beneficially with other compounds which regulate the - intracellular pH, with suitable combination partners being, for example, inhibitors of the carbonate dehydratase enzyme group, inhibitors of systems transporting bicarbonate ions, such as of the sodium bicarbonate cotransporter (NBC) or of the sodium- dependent chloride-bicarbonate exchanger (NCBE), and NHE inhibitors with inhibitory effect on other NHE subtypes, because it is possible through them to enhance or modulate the pharmacologically relevant pH-regulating effects of the NHE inhibitors described herein.
• suitable combination partners being, for example, inhibitors of the carbonate dehydratase enzyme group, inhibitors of systems transporting bicarbonate ions, such as of the sodium bicarbonate cotransporter (NBC) or of the sodium- dependent chloride-bicarbonate exchanger (NCBE), and NHE inhibitors with inhibitory effect on other NHE subtypes, because it is possible through them to enhance or modulate the pharmacologically
• the use of the compounds of the invention relates to the prevention and treatment of acute and chronic diseases in veterinary and human medicine, in particular human medicine.
• the NHE inhibitors of the invention are suitable for the treatment of diseases caused by ischemia and by reperfusion.
• the compounds described herein are suitable because of their pharmacological properties as antiarrhythmic medicaments.
• the NHE inhibitors of the formula I and/or the pharmaceutically acceptable salts thereof are outstandingly suitable for infarction prophylaxis and infarction treatment and for the treatment of angina pectoris, in which cases they also preventively inhibit or greatly reduce the pathophysiological processes associated with the development of ischemia-induced damage, in particular in the triggering of ischemia-induced cardiac arrhythmias.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof used according to the invention can, because of inhibition of the cellular Na + /H + exchange mechanism, be used as medicaments for the treatment of all acute or chronic ischemia-induced damage or diseases induced primarily or secondarily thereby.
• the compounds can be used during organ transplantations, it being possible to use the compounds both to protect the organs in the donor before and during the removal, to protect removed organs for example during treatment with or storage thereof in physiological bath liquids, and during transfer to the recipient organism.
• the compounds of the invention are likewise valuable medicaments with a protective effect when performing angioplastic surgical interventions, for example on the heart as well as on peripheral organs and vessels.
• the compounds of the invention are exceptionally effective medicaments for life-threatening arrhythmias. Ventricular fibrillation is terminated and the physiological sinus rhythm of the heart is restored.
• NHE1 inhibitors of human tissue and organs, especially the heart protect effectively not only against damage caused by ischemia and reperfusion but also against the cytotoxic effect of medicaments like those used in particular in cancer therapy and the therapy of autoimmune diseases
• combined administration with compounds of the formula I and/or the pharmaceutically acceptable salts thereof is suitable for inhibiting the cytotoxic, especially cardiotoxic, side effects of said compounds.
• the reduction in the cytotoxic effects, especially the cardiotoxicity, resulting from comedication with NHE1 inhibitors makes it additionally possible to increase the dose of the cytotoxic therapeutic agents and/or to prolong the medication with such medicaments.
• the therapeutic benefits of such a cytotoxic therapy can be considerably increased by combination with NHE inhibitors.
• NHE1 inhibitors of the invention of the formula I and/or the pharmaceutically acceptable salts thereof can be used when there is heart-damaging overproduction of thyroid hormones, thyrotoxicosis, or on external supply of thyroid hormones.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are thus suitable for improving therapy with cardiotoxic medicaments.
• the compounds of the invention are also suitable as medicaments for the treatment of ischemias of the nervous system, especially of the central nervous system, being suitable for example for the treatrnent of stroke or of cerebral edema.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are also suitable for the therapy and prophylaxis of diseases and disorders induced by overexcitability of the central nervous system, in particular for the treatment of epileptic disorders, centrally induced clonic and tonic spasms, states of psychological depression, anxiety disorders and psychoses.
• NHE inhibitors described herein alone or in combination with other substances with antiepileptic activity or antipsychotic active ingredients, or carbonate dehydratase inhibitors, for example with acetazolamide, and with other inhibitors of NHE or of the sodium-dependent chloride-bicarbonate exchanger (NCBE).
• the compounds according to the invention of the formula I and/or the pharmaceutically acceptable salts thereof are additionally likewise suitable for the treatment of types of shock such as, for example, of allergic, cardiogenic, hypovolemic and bacterial shock.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof can likewise be used for the prevention and treatment of thrombotic disorders because they, as NHE inhibitors, are able to inhibit platelet aggregation themselves. They are additionally able to inhibit or prevent the excessive release, occurring after ischemia and reperfusion, of mediators of inflammation and coagulation, especially of von
• the NHE inhibitors of the present invention can therefore be combined with other anticoagulant and/or thrombolytic active ingredients such as, for example, recombinant or natural tissue plasminogen activator, streptokinase, urokinase, acetylsalicylic acid, thrombin antagonists, factor Xa antagonists, medicinal substances with fibrinolytic activity, thromboxane receptor antagonists, phosphodiesterase inhibitors, factor Vila antagonists, clopidogrel, ticlopidine etc.
• thrombolytic active ingredients such as, for example, recombinant or natural tissue plasminogen activator, streptokinase, urokinase, acetylsalicylic acid, thrombin antagonists, factor Xa antagonists, medicinal substances with fibrinolytic activity, thromboxane receptor antagonists, phosphodiesterase inhibitors, factor Vila antagonists, clopidogrel, ticlopidine etc.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof used according to the invention are additionally distinguished by a strong inhibitory effect on the proliferation of cells, for example fibroblast proliferation and the proliferation of smooth vascular muscle cells.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are therefore suitable as valuable therapeutic agents for diseases in which cellular proliferation represents a primary or secondary cause, and can therefore be used as antiatherosclerotics, agents for chronic renal failure, cancers.
• NHE inhibitors It was possible to show that cell migration is inhibited by NHE inhibitors.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are therefore suitable as valuable therapeutic agents for diseases in which cell migration represents a primary or secondary cause, such as, for example, cancers with a pronounced tendency to metastasis.
• CHF congestive heart failure
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are suitable for the prevention and treatment of high blood pressure and of cardiovascular disorders. In these cases they can be used alone or with a suitable combination and formulation partner for the treatment of high blood pressure and of cardiovascular disorders.
• diuretics with a thiazide-like action, loop diuretics, aldosterone and pseudoaldosterone antagonists, such as hydrochlorothiazide, indapamide, polythiazide, furosemide, piretanide, torasemide, bumetanide, amiloride, triamterene, spironolactone or eplerone.
• a thiazide-like action such as hydrochlorothiazide, indapamide, polythiazide, furosemide, piretanide, torasemide, bumetanide, amiloride, triamterene, spironolactone or eplerone.
• the NHE inhibitors of the present invention can further be used in combination with calcium channel blockers such as verapamil, diltiazem, amlodipine or nifedipine, and with ACE inhibitors such as, for example, ramipril, enalapril, lisinopril, fosinopril or captopril.
• calcium channel blockers such as verapamil, diltiazem, amlodipine or nifedipine
• ACE inhibitors such as, for example, ramipril, enalapril, lisinopril, fosinopril or captopril.
• beta-blockers such as metoprolol, albuterol etc., antagonists of the angiotensin receptor and its receptor subtypes such as losartan, irbesartan, valsartan; omapatrilat, gemopatrilat, endothelin antagonists, renin inhibitors, adenosine receptor agonists, inhibitors and activators of potassium channels such as glibenclamide, glimepiride, diazoxide, cromakalim, minoxidil and derivatives thereof, activators of the mitochondrial ATP-sensitive potassium channel (mitoK(ATP) channel), inhibitors of Kv1.5 etc.
• angiotensin receptor and its receptor subtypes such as losartan, irbesartan, valsartan
• omapatrilat, gemopatrilat endothelin antagonists
• renin inhibitors renin inhibitors
• adenosine receptor agonists inhibitors and activators of potassium channels
• NHE1 inhibitors of the formula ! and/or the pharmaceutically acceptable salts thereof have a significant antiinflammatory effect and can thus be used as antiinflammatory drugs. Inhibition of the release of mediators of inflammation is noteworthy in this connection.
• the compounds can thus be used alone or in combination with an antiinflammatory drug for the prevention or treatment of chronic and acute inflammatory disorders. Combination partners advantageously used are steroidal and non-steroidal antiinflammatory drugs.
• the compounds of the invention can also be used for the treatment of disorders caused by protozoa, of malaria and of coccidiosis in poultry.
• hypolipidemics should be able to reduce not only total cholesterol but, in particular, the VLDL and LDL serum cholesterol fractions.
• NHE1 inhibitors show valuable therapeutically utilizable properties in relation to influencing the serum lipid levels.
• they significantly reduce the elevated serum concentrations of LDL and VLDL as are to be observed, for example, due to increased dietary intake of a cholesterol- and lipid-rich diet or in cases of pathological metabolic alterations, for example genetically related hyperlipidemias. They can therefore be used for the prophylaxis and regression of atherosclerotic lesions by eliminating a causal risk factor.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof lead to a marked reduction in the infarctions induced by metabolic abnormalities and, in particular, to a significant reduction in the induced infarct size and the severity thereof.
• Said compounds are therefore advantageously used for producing a medicament for the treatment of hypercholesterolemia; for producing a medicament for the prevention of atherogenesis; for producing a medicament for the prevention and treatment of atherosclerosis, for producing a medicament for the prevention and treatment of diseases induced by elevated cholesterol levels, for producing a medicament for the prevention and treatment of diseases induced by endothelial dysfunction, for producing a medicament for the prevention and treatment of atherosclerosis-induced hypertension, for producing a medicament for the prevention and treatment of atherosclerosis-induced thromboses, for producing a medicament for the prevention and treatment of hypercholesterolemia-induced and endothelial dysfunction-induced ischemic damage and post-ischemic reperfusion damage, for producing a medicament for the prevention and treatment of hypercholesterolemia-induced and endothelial dysfunction-induced cardiac hypertrophies and cardiomyopathies and of congestive heart failure (CHF), for producing .a medicament for the prevention and treatment of hypercholesterolemia-induced and endothelial dysfunction-induced coronary
• an HMG-CbA reductase inhibitor for example lovastatin or pravastatin
• compounds of the formula I and/or the pharmaceutically acceptable salts thereof lead to effective protection against endothelial damage of various origins.
• This protection of the vessels against the syndrome of endothelial dysfunction means that the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are valuable medicaments for the prevention and treatment of coronary vasospasms, peripheral vascular diseases, in particular intermittent claudication, atherogenesis and atherosclerosis, left ventricular hypertrophy and dilated cardiomyopathy and thrombotic disorders.
• NIDDM non-insulin- dependent diabetes
• compounds of the formula I and/or the pharmaceutically acceptable salts thereof are suitable in the treatment of non-insulin- dependent diabetes (NIDDM), with the insulin resistance being restrained.
• NIDDM non-insulin- dependent diabetes
• a biguanide such as metformin
• an antidiabetic sulfonylurea such as glyburide, glimepiride, tolbutamide etc.
• a glucosidase inhibitor with a PPAR agonist such as rosiglitazone, pioglitazone etc.
• an insulin product of different administration form with a DB4 . inhibitor
• an insulin sensitizer or with meglitinide with an insulin sensitizer or with meglitinide.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof counteract the development of late complications of diabetes and can therefore be used as medicaments for the prevention and treatment of late damage from diabetes, such as diabetic nephropathy, diabetic retinopathy, diabetic cardiomyopathy and other disorders occurring as a consequence of diabetes. They can in this connection be advantageously combined with the antidiabetic medicaments just described under NIDDM treatment. The combination with a beneficial dosage form of insulin should be particularly important in this connection.
• the NHE inhibitors of the invention of the formula I and/or the pharmaceutically acceptable salts thereof show, besides the protective effects against acute ischemic events and the subsequent equally acutely stressing reperfusion events, also direct therapeutically utilizable effects against diseases and disorders of the entire mammalian organism which are associated with the manifestations of the chronically progressive aging process and which occur independently of acute hypoperfusion states and under normal, non-ischemic conditions.
• These pathological, age-related manifestations induced over the long aging period, such as illness, invalidity and death, which can now be made amenable to treatment with NHE inhibitors are diseases and disorders which are essentially caused by age-related changes in vital organs and the function thereof and become increasingly important in the aging organism.
• disorders connected with an age-related functional impairment or with age-related manifestations of wear of organs are, for example, the inadequate response and reactivity of the blood vessels to contraction and relaxation reactions.
• This age-related decline in the reactivity of vessels to constricting and relaxing stimuli which are an essential process of the cardiovascular system and thus of life and health, can be significantly eliminated or reduced by NHE inhibitors.
• One important function and a measure of the maintenance of the reactivity of vessels is the blockade or retardation of the age-related progression in endothelial dysfunction, which can be eliminated highly significantly by NHE inhibitors.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are thus outstandingly suitable for the treatment and prevention of the age-related progression in endothelial dysfunction, especially of intermittent claudication.
• An example of another variable characterizing the aging process is the decline in the contractability of the heart and the decline in the adaptation of the heart to a required pumping output of the heart.
• This diminished.efficiency of the heart as a consequence of the aging process is in most cases connected with a dysfunction of the heart which is caused inter alia by deposition of connective tissue in the myocardial tissue.
• This deposition of connective tissue is characterized by an increase in the weight of the heart, by an enlargement of the heart and by restrictive cardiac function. It was surprising that it was possible almost completely to inhibit such aging of the heart organ.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are thus outstandingly suitable for the treatment and prevention of heart failure, of congestive heart failure (CHF).
• NHE inhibitors also makes it possible, besides the use of the active ingredients alone on humans and animals, to combine these NHE inhibitors with other active principles, measures, substances and natural products which are used in gerontology and which are based on a different mechanism of action.
• active ingredients used in gerontological therapy are: in particular vitamins and substances with antioxidant activity.
• the combination with dietary measures can take place for example with appetite suppressants. It is likewise possible to consider a combination with hypotensive medicaments such as with ACE inhibitors, angiotensin receptor antagonists, diuretics, Ca 2+ antagonists etc. or with metabolism-normalizing medicaments such as cholesterol-lowering agents.
• hypotensive medicaments such as with ACE inhibitors, angiotensin receptor antagonists, diuretics, Ca 2+ antagonists etc. or with metabolism-normalizing medicaments such as cholesterol-lowering agents.
• the compounds of the formula I and/or the pharmaceutically acceptable salts thereof are thus outstandingly suitable for the prevention of age-related tissue changes and for prolonging life while retaining a high quality of life.
• the compounds of the invention are effective inhibitors of the cellular sodium-proton antiporter (Na/H exchanger) which in a large number of disorders (essential hypertension, atherosclerosis, diabetes etc.) is also increased in cells which are readily amenable to measurements, such as, for example, in erythrocytes, platelets or leucocytes.
• the compounds according to the invention are therefore suitable as outstanding and simple scientific tools, for example in their use as diagnostic agents for determining and distinguishing different types of hypertension, but also of atherosclerosis, diabetes and the late complications of diabetes, proliferative disorders etc.
• the present invention also relates to processes for synthesising 3-guanidinocarbonyl- 1-heteroaryl-indole derivatives of the formula (I).
• the compounds of the general formula (I) can be prepared from the 3-alkoxycarbonyl- 1 H-indoles of the formula (II) in accordance with the following general synthetic scheme:
• the general synthetic scheme is as follows: a) a heteroaryl halide ArX of the formula (VI) is reacted with 3-alkoxycarbonyl-1 H- indole of the formula (II) b) the obtained 3-alkoxycarbonyl-1-heteroaryl-indole of the formula (III) is saponified c) the 3-carboxy-1-heteroaryl-indole of the formula (IV) is converted in the acid chloride of formula (V) d) the obtained product of formula (V) is reacted with guanidine wherein in the compounds of the formula II, III, IV, V and VI Ar and R1 to R3 are defined as in the compounds of the formula I, X is F, CI, Br or l and R is alkyl having 1 , 2, 3, 4, 5 or 6 carbon atoms.
• the product is isolated and is optionally converted into a pharmaceutically acceptable salt.
• Reaction (a) between a suitable 3-alkoxycarbonyl-1 H-indole of the formula (II) and a suitable heteroaryl halide ArX of the formula (VI) is preferably performed under an inert atmosphere (for example under nitrogen or under argon) in a basic medium, for example in the presence of potassium carbonate in an inert solvent, such as dimethyl sulphoxide, at a temperature of between 20°C and the boiling point of the reaction medium, preferably at a temperature in the region of 100°C, or in the presence of sodium hydride in an inert solvent, such as dimethylformamide, at a temperature of between 20°C and the boiling point of the reaction medium, preferably at a temperature in the region of 120°C.
• an inert atmosphere for example under nitrogen or under argon
• a basic medium for example in the presence of potassium carbonate in an inert solvent, such as dimethyl sulphoxide, at a temperature of between 20°C and the boiling point of the reaction medium,
• reaction (a) between a suitable 3-alkoxycarbonyl-1 H-indole of the formula (II) and a suitable heteroaryl halide ArX of the formula (VI) can be performed preferably under an inert atmosphere (for example under nitrogen or under argon) in a basic medium, for example in the presence of potassium orthophosphate, copper iodide and trans-1 ,2-cyclohexanediamine, in an inert solvent, such as a mixture of 1 ,4- dioxane and n-dodecane, at a temperature of between 20°C and the boiling point of the reaction medium, preferably at a temperature in the region of 100°C.
• an inert atmosphere for example under nitrogen or under argon
• a basic medium for example in the presence of potassium orthophosphate, copper iodide and trans-1 ,2-cyclohexanediamine
• an inert solvent such as a mixture of 1 ,4- dioxane and n-dodecan
• Reaction (b) is generally performed according to the usual methods that do not affect the rest of the molecule, in particular by applying the methods described by
• the saponification reaction (b) of a suitable 3- alkoxycarbonyl-1-heteroaryl-1 H-indole of the formula (III) is performed in a basic medium, for example in the presence of lithium hydroxide monohydrate, in an inert solvent, such as a mixture of tetrahydrofuran and water, at a temperature of between 20°C and the boiling point of the reaction medium, preferably at the reflux point of the reaction medium.
• a basic medium for example in the presence of lithium hydroxide monohydrate
• an inert solvent such as a mixture of tetrahydrofuran and water
• Reaction (c) is generally performed according to the usual methods that do not affect the rest of the molecule, in particular by applying the methods described by Bradford P. Mundy and Michael G. Ellerd, Name Reactions and Reagents in Organic Synthesis, A. Wiley, Interscience Publication (1988).
• the reaction (c) for the formation of the acid chloride of a suitable 3-carboxy-1-heteroaryl-1 H-indole of the formula (IV) is preferably performed under an inert atmosphere (for example under nitrogen or under argon) in the presence of oxalyl chloride in an inert solvent, such as dichloromethane, at a temperature of between 20°C and the boiling point of the reaction medium, preferably at a temperature in the region of 20°C, or in the presence of sulphinyl chloride in an inert solvent, such as chloroform, at a temperature of between 20°C and the boiling point of the reaction medium, preferably at the reflux point of the reaction medium.
• an inert atmosphere for example under nitrogen or under argon
• oxalyl chloride in an inert solvent such as dichloromethane
• sulphinyl chloride in an inert solvent such as chloroform
• Reaction (d) between a suitable 3-chlorocarbonyl-1-heteroaryl-1 H-indole of the formula (V) and guanidine is preferably performed under an inert atmosphere (for example under nitrogen or under argon) in an inert solvent, such as 1 ,2-dimethoxyethane or tetrahydrofuran, at a temperature in the region of 20°.
• an inert atmosphere for example under nitrogen or under argon
• an inert solvent such as 1 ,2-dimethoxyethane or tetrahydrofuran
• the compounds of the formula (I) are isolated and can be purified by the usual known methods, for example by crystallisation, chromatography or extraction.
• the compounds of the formula I can optionally be converted into addition salts with an inorganic or organic acid by reacting with such an acid in a solvent, e.g. an organic solvent such as an alcohol, a ketone, an ether or a chlorinated solvent.
• a solvent e.g. an organic solvent such as an alcohol, a ketone, an ether or a chlorinated solvent.
• salts examples include the following salts: benzenesulphonate, hydrobromide, hydrochloride, acetate, citrate, ethanesulphonate, fumarate, gluconate, iodate, maleate, isethionate, methanesulphonate, methylenebis( ⁇ -oxynaphthoate), nitrate, oxalate, pamoate, phosphate, salicylate, succinate, sulphate, tartrate, theophyllinacetate and p-toluenesulphonate.
• the compounds contain an acid group, they are capable of forming salts with bases, for example alkali metal salts, preferably sodium or potassium salts, or ammonium " " salfs ⁇ for example salts with ammonia or organic amines or amino acids. They can also be present as zwitterions.
• bases for example alkali metal salts, preferably sodium or potassium salts, or ammonium " " salfs ⁇ for example salts with ammonia or organic amines or amino acids. They can also be present as zwitterions.
• the resulting aqueous solution is washed with 30 crr)3 of ethyl acetate, adjusted to pH 6 with N hydrochloric acid and extracted with 50 cm ⁇ of ethyl acetate.
• the organic phase is dried over magnesium sulphate and concentrated to dryness under reduced pressure (2.7 kPa).
• the solid obtained is triturated in 20 cr ⁇ )3 of isopropyl ether and filtered off, resulting in 0.3 g of 3- carboxy-1-(2-(trifluoromethyl)quinol-4-yl)-1 H-indole in the form of a yellow powder.
• Example 7 a) 3-Guanidinocarbonyl-1 -(7-methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1 H-indole hydrochloride
• reaction mixture is stirred at a temperature in the region of 20°C for 1 hour, 1.35 g (8.05 mmol) of 4-chloro-7- methyl-7H-pyrrolo[2,3-d]pyrimidine in 10 cm 3 of dimethylformamide are then added, and the mixture is heated at a temperature in the region of 100°C for 16 hours.
• the reaction mixture is then cooled to a temperature in the region of 20°C and then poured into a mixture of 200 cm 3 of ethyl acetate and 200 cm 3 of water.
• Example 8 a) N-[1-(2-Methyl-quinolin-4-yl)-1 H-indole-3-carbonyl]-guanidine trifluoroacetate
• a solution of guanidine in dry DMF is prepared by stirring 5 mmol (560 mg) of potassium t-butoxide and 5.5 mmol (525 mg) of guanidine hydrochloride in 5 ml DMF for 30 minutes at room temperature under exclusion of moisture. To the resulting suspension is added the methyl ester obtained above, the mixture is stirred for 18 h at room temperature under argon. The mixture is filtered and the filtrate directly subjected to purification by prep. HPLC (acetonitrile/H2 ⁇ + 0.1 % trifluoroactetic acid) to yield N-
• NHE inhibitory activities (IC50 values) of the compounds according to the invention were determined by a FLIPR test.
• the test is performed in the FLIPR (Fluorescent Imaging Plate Reader) equipped with clear-bottomed and black-walled 96-well microtitration plates.
• the transfected cell lines expressing the various NHE subtypes are seeded the preceding day at a density of -25 000 cells/well.
• the growth medium for the transfected cells (Iscove +10% foetal calf serum) also comprises G418 as selection antibiotic to ensure the presence of transfected sequences.
• the actual test begins by eliminating the growth medium and adding 100 ⁇ l of loading buffer per well (5 ⁇ M of BCECF-AM [2',7'-bis(2-carboxyethyl)-5-(6)- carboxyfluoresceine acetoxymethyl ester] in 20 mM of NH4CI, 115 mM of choline chloride, 1 mM of CaC ⁇ , 5 mM of KCI, 20 mM of HEPES and 5 mM of glucose; pH 7.4 (adjusted with KOH).
• the cells are then incubated for 20 minutes at 37°C. This incubation results in the loading of the fluorescent dye into the cells, the fluorescence intensity of which depends on the pHj, and on the NH4CI, which results in a slight basification of the cells.
• the precursor BCECF-AM a non-fluorescent dye
• the actual dye which is incapable of crossing the membrane, is released inside the cell by esterases.
• the loading buffer which comprises NH4CI and free BCECF-AM
• the loading buffer is removed by washing three times in the cell washing device (Tecan Columbus), each wash being performed with 400 ⁇ l of washing buffer (133.8 mM of choiine chloride, 4.7 mM of KCI, 1.25 mM of MgCl2, 1.25 mM of CaCl2, 0.97 mM of
• the washing process results in intracellular protons remaining, which is the cause of the intracellular acidification. This acidification can result finally in the death of the cells if it lasts long enough. It is important here for the washing buffer to be free of sodium ( ⁇ 1 mM), otherwise the extracellular sodium ions would result in an immediate increase in the pHj on account of the activity of the cloned NHE isoforms.
• the microtiter plates containing acidified cells are then transferred (up to 20 minutes after the acidification) to the FLIPR.
• the intracellular fluorescent dye is activated with light of a wavelength of 488 nm, which is generated by an argon laser, and the measuring parameters (laser power, illumination time and diaphragm of the CDD camera integrated into the FLIPR) are chosen such that the average value of the fluorescent signal per well is between 30,000 and 35,000 relative fluorescence units.
• the actual measurement in the FLIPR starts with a photograph being taken by the CCD camera every two seconds under software control. After 10 seconds, the increase in the intracellular pH is initiated by adding 90 ⁇ l of regeneration buffer
• the experimental data allow the NHE activities to be calculated for each concentration of test substance and, from these, the IC50 values of the substances.
• the NHE-1 subtype the following results are obtained.
• the invention relates also to the use of the compounds of the formula I and/or pharmaceutically acceptable salts thereof for the preparation of medicaments and pharmaceutical compositions as inhibitors of the NHE.
• Claimed is a medicine for human, veterinary or phytoprotective use, comprising an effective amount of a compound of the formula I and/or the pharmaceutically acceptable salts thereof, together with pharmaceutically acceptable carriers and additives, alone or in combination with other active pharmaceutical ingredients or medicaments.
• compositions according to the invention consist of a compound of the formula I and/or the pharmaceutically acceptable salt thereof, in pure form or in the form of a composition in which it is combined with any other pharmaceutically compatible product, which may be inert or physiologically active.
• the medicaments according to the invention can be administered, for example, orally, parenterally, intravenously, rectally, transdermally, topically or by inhalation.
• the medicaments generally comprise active ingredients of the formula I and/or pharmaceutically acceptable salts therof in an amount of from 0.001 mg to 1 g per dose unit.
• excipients suitable for the desired pharmaceutical formulation are familiar to the skilled 'worker on the basis of his expert knowledge.
• solvents, gel formers, suppository bases, tablet excipients, and other active ingredient carriers it is possible to use, for example, antioxidants, dispersants, emulsifiers, antifoams, flavourings, preservatives, solubilizers or colors.
• the active compounds are mixed with additives suitable for this purpose, such as carriers, stabilizers or inert diluents, and converted by conventional methods into suitable dosage forms such as tablets, coated tablets, hard gelatin capsules, aqueous, alcoholic or oily solutions.
• additives suitable for this purpose such as carriers, stabilizers or inert diluents, and converted by conventional methods into suitable dosage forms such as tablets, coated tablets, hard gelatin capsules, aqueous, alcoholic or oily solutions.
• inert carriers examples include gum arabic, magnesia, magnesium carbonate, potassium phosphate, lactose, glucose or starch, especially corn starch. It is moreover possible for the preparation to take place both as dry granules and as wet granules.
• suitable oily carriers or solvents are vegetable or animal oils such as sunflower oil Or fish liver oil.
• compositions for oral administration can be used as solid compositions for oral administration.
• the active principle according to the invention is mixed with one or more inert diluents, such as starch, cellulose, sucrose, lactose or silica, under a stream of argon.
• inert diluents such as starch, cellulose, sucrose, lactose or silica
• These compositions may also comprise substances other than diluents, for example one or more lubricants, such as magnesium stearate or talc, a colorant, a coating (dragees) or a varnish.
• compositions for oral administration can be used as liquid compositions for oral administration.
• inert diluents such as water, ethanol, glycerol, plant oils or liquid paraffin
• compositions may comprise substances other than diluents, for example wetting products, sweeteners, thickeners, flavourings or stabilisers.
• the sterile compositions for parenteral administration may preferably be aqueous or non-aqueous solutions, suspensions or emulsions.
• Solvents or vehicles that can be used include water, propylene glycol, a polyethylene glycol, plant oils, in particular olive oil, injectable organic esters, for example ethyl oleate, or other suitable organic solvents.
• These compositions may also comprise adjuvants, in particular wetting agents, tonicity agents, emulsifiers, dispersants and stabilisers.
• the sterilisation may be performed in several ways, for example by aseptic filtration, by incorporating sterilising agents into the composition, by irradiation or by heating. They may also be prepared in the form of sterile solid compositions that may be dissolved at the time of use in sterile water or any other injectable sterile medium.
• compositions for rectal administration are suppositories or rectal capsules that comprise, besides the active product, excipients, such as cocoa butter, semi-synthetic glycerides or polyethylene glycols.
• compositions for topical administration may be, for example, creams, lotions, eye drops, mouthwashes, nasal drops or aerosols.
• the active compounds used are converted, if desired with the substances customary for this purpose, such as solubilizers, emulsifiers or other excipients, into a solution, suspension or emulsion.
• suitable solvents are: water, physiological saline or alcohols, e.g. ethanol, propanol, glycerol, as well as sugar solutions such as glucose or mannitol solutions, or else a mixture of the various solvents mentioned.
• Suitable as pharmaceutical formulation for administration in the form of aerosols or sprays are, for example, solutions, suspensions or emulsions of the active ingredient of the formula I and/or the pharmaceutically acceptable salts thereof in a pharmaceutically acceptable solvent such as, in particular, ethanol or water, or a mixture of such solvents.
• a pharmaceutically acceptable solvent such as, in particular, ethanol or water, or a mixture of such solvents.
• the formulation may, if required, also contain other pharmaceutical excipients such as surfactants, emulsifiers and stabilizers, and a propellant gas.
• Such a preparation contains, for example, the active ingredient in a concentration of about 0.1 to 10, in particular of about 0.3 to 3% by weight.
• the dosage of the active ingredient of the formula I to be administered, and the frequency of administration, depend on the desired effect, the potency and duration of action of the compounds used; additionally also on the nature and severity of the disorder to be treated and on the sex, age, weight and individual responsiveness of the mammal to be treated. In general, the doctor will determine the appropriate dosage as a function of the age and weight and all the other factors specific to the individual to be treated.
• the daily dose of a compound of the formula I and/or the pharmaceutically acceptable salts thereof for a patient weighing about 75 kg is at least 0.001 mg/kg, preferably 1 mg/kg, to a maximum of 1000 mg/kg, preferably 100 mg/kg, of body weight.
• higher and, in particular, more frequent dosages may also be necessary, e.g. up to 4 single doses a day.
• Up to 2000 mg a day may be necessary, in particular on i.v. administration, for example for a patient with infarction in the intensive care unit, and the compounds of the invention can- be administered by infusion.
• Gel capsules containing a 50 mg dose of active product having the composition below, can be prepared according to the usual technique:
• Tablets comprising a 50 mg dose of active product, having the composition below, can be prepared according to the usual technique:
• An injectable solution comprising 10 mg of active product, having the composition below, can be prepared:

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